Power-hammer.



Patented July 6,1909.

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POWER HAMMER.

'APPLIUATION FILED In a, 19os.

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H. J. G. KEYMER.

POWER HAMMER. APPLICATION FILED MAY 8,1908.

Patented July 6, 1909.

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POWER HAMMER.

APPLICATION FILED MAY s, 1908.

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UNITED sTATEs KiafiTnNT onirica.

HENRY JOHN OUBITT KEYMER, OF GREAT YARMOUTH, ENGLAND.

POWER-HAMMER.

To all whom it may concern.'

Be it known that I, HENRY JonN OUBITT KEYMER, a subject of the King ofthe United Kingdom of Great Britain and Ireland, and residing at Gorleston-onSea, Great Yarmouth, England, have invented certain new and useful Improvements in Power-llammers, of which the following is a specifica tion.

This invention relates to hammers actuated by fluid pressure and it has for its ohject to provide an improved arrangement of valve mechanism and also to adapt the tool holder or socket to loe rotated and reciprocated so as to serve as a rock or other drill.

The invention is illustrated in the accompanying drawings in which* Figure 1 is a part elevation and part vertical section of the improved hammer: Fig. 2

is a plan (With the cover removed). Figs. 3, 4. and 5 are plan views of the disk valve seat, the valve diaphragm and the disk valve, respectively. Fig. 6 is a part sectional plan showing an arrangement in which the sleeve actuates the valve or valves direct. Fig. 7 is a vertical section corresponding to Fig. 6 and shows the handle of the hammer formed hollow to serve as an oil reservoir. F 8 is a detail view of the hammer handle. Fig. 9 shows in vertical section a modified arrangement wherein the oscillating sleeve is caused to actuate a piston valve or valves through the intermediary of levers. Fig. 10 is a horizontal section through the sleeve. Fig. 1l is a vertical section and Fig. 12 is an elcvation at right angles to Fig. 11 showing an alternative arrangement for actuating the piston valve or valves, the oscillating sleeve being dispensed with. Figs. 13 and 111 show in plan and elevation respectively the bush of the hammer piston cylinder.

As shown in Figs. 1 to 5, the cylinder A, having a portion extended to ferm a hammer guide A1, and the tool socket holder A2 form the main structure. Outside the wall of the cylinder hush Aa is a assage or portway Z (shown particularly at ligs. 13 and 14) preferably slotted thereon and extending to the upper end of the cylinder to provide for passage of the fluid for the hack or inward stroke of the piston F. Nithin the head or valve chest B is fixed a flat circular valve seating O with one port O2 over the said passage Z, and another port Ol over the end of the piston F. A flat circular valve E works upon the seating Specification of Letters Patent.

Application filed May 8, 1908.

Patented July 6, 1909.

Serial No. 431,727.

C and has two separate inlet ports El and E2 and two separate exhaust or outlet ports G1 and G2 thus, the inlet port El and the outlet or exhaust port G1 each operate over the port O1 and the other ports E2 and G2 operate over the passage Z. n the forward stroke of the piston F the inlet port El and the exhaust port G2 are each open and the others covered, but are ready to act on oscillation of the valve E on the seating O, which latter motion is caused hy a projection L2 on a sleeve L hereinafter referred to. Over the valve E is iixed a metal sheet H which presses upon the valve E to make a tight joint, and has two inlet ports H1 and H2 corresponding in position to the ports C1 and O2, so that when one inlet ort of the valve E is open the other is closed). rlhe positions of the ports thus combined are such that when the port El is open the motive fluid passes through the ports H1 and C1 and forces the piston forward to complete its outward stroke; at the same time the exhaust port G2 is open over the passage Z and allows the exhaust fluid from the under side to escape. rFliese ports remain open until by the continued travel of the piston F the valve E is actuated and the position of the ports altered in which case the direction of travel of the piston F will he reversed. Corresponding to the two exhaust ports G1 and G2, ports B1 and B2 are provided in the walls of the head casting B for escape of the exhaust fluid during the outward and inward strokes of the piston F. The piston F, piston rod F1 and hammer l constitute one moving body. ln the hammer head is :fixed a guide pin K which travels in a slot M in the hammer guide part A1 of the cylinder or main structure. On the outside of the cylinder casting there are bearing surfaces wher-een works a sleeve L which has an inclined slot L1 and to which is imparted a rocking or oscillating motion by the pin ,K in the hammer head engaging with said inclined slot L1; the sleeve L heing caused to oscillate according to the form of the path of the slotted aperture L1. This arrangement enables the motive power to be used expansively with a free exhaust. rlhe upper end of the sleeve L has a projection L2 adapted to pass through an arcuate slot B3 in the head casting B, through a cut-away recessed edge OX of the valve seating C and then fits into the exhaust port G2 on, the under side of the valve E, so that on oscillation of the sleeve L, a rocking movement is imparted to the valve E u on the valve seating C. The tool socket ho der A2 carries a tool socket O, having a slight movement within the same so that the tool which is 'fitted in and secured to the socket O in any suitable manner receives the impact of the hammer.

In a modiiied construction shown in Figs. 6 to S, the upper end et the sleeve L has two wings or projections L2 and L3 which oscillate over or in front of a valve chamber E0 in a head casting D the base of which latter is iitted within 'the cylinder bush A and upon the llanged end oi" the main structure or cylinder casting A. ln the head casting is a power' inlet Q for the admission of the motive iluid, said pipe having within it a throttle valve N resting upon a seat R in liront of a starting pin S. Gn the ends ol' said pin is secured the trigger clamp S1 (Fig. 8) which on being moved in one direction presses the valve N oli its seat R, or on being moved in the opposite direction allows the valve to rest on its seat. When the valve N is raised from its seat the power iiuid passes by way of the passage Q1 into the valve chamber E0 and thence through the port C1 to the upper side of the hammer piston, or through the port C2 and passage Z to the under side of the hammer piston. r1`he piston valve or valves E11 and E12 have the pressure of the motive power always upon their inner surfaces, which in the ease of separate valves keeps them apart and forces each valve with its roller E3 or E4 upon or in contact with the sleeve wings L2 and L3. As shown in Figs. 6 and 7, the valve E11 has been opened clear of the port C1 so that the motive fluid can act upon the upper side of the piston, while the exhaust lluid will escape by way of the passage Z and the port C2 into the valve chamber E0, and thence by way of a port D2 into the atmosphere. ln a position of the valves corresponding to that shown in Fig. 1, the sleeve L and wings L2 and L3 will have been oscillated by the pin K (Fig. 1) operating in the slotted aperture L1 and have actuated the piston valve or valves so as to open the port C2 (Figs. 6 and 7) located over the passage way Z for the admission of the motive iluid to the underside ot the hammer piston and also to open communication between the ports C1 and D1 and allow the exhaust 'fluid from the piston head to escape into the atmosphere. rlhe coniiguration of the sleeve aperture L1 in conjunction with the shape or form of the inside of the wings L2 and L3 will control eXpansively the use of the motive fluid. For more convenient lubrication of the internal parts of the mechanism, the handle of the head casting D is made hollow to serve as an oil reservoir and has a passage l/V connected to the power inlet Q, as shownparticularly at Fig. S.

In a further modiiied construction shown in Figs. 9 and 10, the cap or cover contains the piston valve or valves B11 and B21 and a bush or liner C having two portways C1 and C2, the portway C1 bein close within the circle of the cylinder A, over the end oi the piston and upon the opposite side from the pas'- sage Z, while the portway C2 is directly over the said passage Z and outside the lining D. The duplex piston valve or two separate piston valves B11 and B21 works or worl within. the bush C over the ports C1 and C2. In the arrangement shown each piston valve is formed with an exhaust port BX and a suitable recess B0 in the underside for engagement by the ends of levers E21 and E22 which pass through slots in the under side of the valve chest in order to operate said valves. rihe levers E21 and E22 are pivoted upon pins F passing through joints made on the outside of the cylinder A. The end of each lever opposite that working within the piston valve is provided with an anti-friction roller G in contact with a sleeve L, the upper portion of which sleeve is of cam-like formation so that on oscillation of the said sleeve L, the levers E21 and E22 will actuate the valves B11 and B21 over the ports C1 and C2, and thereby etfect the reciprocation of the hammer piston. rlhe motive fluid which enters between the inner ends of the valves B11 and B21 at P causes the rollers G to contact with the camlike upper portion of the sleeve L, which may be ol such form as to allow of using the mo tive Al'luid expansively.

Figs. 11 and 1.2 show an arrangement for actuating the piston valves B11 and B21, wherein for the sleeve L (Figs. 9 and 10) are substituted levers M and M1 having cam-like upper ends and pivoted at m and m1 on the hammer guide A1, the edges of said levers being of a form corresponding to that of the aperture L1 (Fig. 1) and operated by the pin K (F ig. 1) on the hammer head, in order to actuate the valve levers E21 and E22 (Figs. 9 to 12) or to actuate directly the valves E11 and E12 (Figs. 6 and 7).

Having new described my invention what 1 claim and desire to secure by Letters Patent of the United States is 1. 1n a power hammer such as described, the combination with a working cylinder, of a valve chest having iitted therein a flat circular valve seating provided with ports communicating with said working cylinder, a lat circular valve with inlet and exhaust ports, a metal sheet or plate secured over said valve and provided with inlets, and a rocking or oscillating sleeve having a projection to actuate said valve.

2. ln a power hammer such as described, the combination with a working cylinder and a piston therein, of a valve chest, a valve or valves within said valve chest, and means for operating said valve or valves, said means comprising a rocking or oscillating sleeve, means for operatively connecting said sleeve and valve or valves, and means carried by said piston for Oscillating said sleeve.

3. In a poWer hammer such as described, the combination With a Working cylinder, of a valve chest, a valve or valves Within said valve chest, and means for Operating said valve or valves, said means including a rocking or oscillating sleeve and means for operatively connecting said sleeve and valve or valves.

4. In a power hammer of the character described, the combination with a Working cylinder and a piston therein, of a valve chest, a valve or valves Within said valve 15 chest, and means for operating said valve or valves, said means comprising a rocking or oscillating member, means for operatively connecting said member and valve or valves, and means carried by said piston and engaging said member for oscillating the same.

In testimony whereof I have signed my name to this specification in the presence of tWo subscribing Witnesses.

HENRY JOHN CUBIT'I KEYMER.

Witnesses:

WALLACE CRANsToN FAIRWEATHER, JOHN MCCLEARY, Jr. 

